(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

An atom or ion with only one electron is excited from the ground state to the first excited state (n = 2) with a photon of 1.47E-17 J of energy. What is the charge on the one-electron species?

A. 0

B. +1

C. +2

D. +3

E. +4

2. Relevant equations

E=-(2.18E-18)(Z^{2})/(N^{2})

3. The attempt at a solution

I plugged in the information given into the equation:

(1.47E-17)=(-2.18E-18)(Z^{2})((1/4)-1)

With some algebra, I got Z=2.998, which may as well be a charge of +3.

However, according to the answer key, the correct answer is, in fact, +2 (C).

I would appreciate any guidance as to where I might be going wrong with this problem. :)

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# Homework Help: Knowing the Energy of a photon, what is the charge of a species?

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